S1105-1-2 CrN薄膜を被覆したTi-6Al-4V合金のフレッティング疲労特性(表面改質とトライボロジー1)

概要

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Fretting fatigue tests were performed using titanium alloy with CrN thin film to examine the effect of hard thin film coating on fretting fatigue properties of titanium alloy. CrN films were deposited at two different bias voltages by arc ion plating method in order to control the film hardness. As the result, The difference of fretting fatigue strength of the coatings was small. These films were collapsed and the substrates were severely damaged at the slip region after fretting fatigue tests, therefore, the improvement of the fretting fatigue strength will be caused by high wear resistance films. However, the fretting fatigue strength of the coatings clearly decreased over 10^6 cycles for some deposition conditions. In this case, the CrN film still covered the substrate surface after failure. The result suggests that the fretting damage accelerates cracking the film and the crack in the film reduces the fretting fatigue strength.
2009-09-12